I've heard several mentions of Rossi 92's in .44 mag having overbore issues. Rumor has it that these Rossi which are distributed through everyone from Cimarron to Puma have bores that can vary from .429 to .432. This also applies to every configuration that Rossi makes from carbines to full length rifles.

Is this all true? How long has this been a problem? Is there anything that can be done to remedy this issue?

I have been hearing all this and of course I've been itching to get an EMF or Cimarron 92 in .44 mag with the 24" octagonal barrel...

Some positive or negative confirmation would be greatly appreciated,

Patrick

Possibly, so what is the question (problem)? I had a Smith & Wesson Model 29 that had a .435 groove diameter!

Typically gun barrels will have a tolerance from nominal of -.001 to+.002 or so. .431 is not an oversize bore.

The question is: Does this great range of groove diameters effect accuracy?
Can normal .429" jacketed bullets and .430" cast lead bullets be used in such an oversized bore up to .432"?

Thanks,

Patrick


Possibly, so what is the question (problem)? I had a Smith & Wesson Model 29 that had a .435 groove diameter!

Typically gun barrels will have a tolerance from nominal of -.001 to+.002 or so. .431 is not an oversize bore.

The question is: Does this great range of groove diameters effect accuracy?
Can normal .429" jacketed bullets and .430" cast lead bullets be used in such an oversized bore up to .432"?

Thanks,

Patrick

The answer is yes. I was merely pointing out that those dimentions fall within a normal range of tolerance, just as .429 nominal bullets can range from .428-.430. If you have a bore that runs .432 you may be better served by a cast bullet sized to fit the bore. Cast bullets of proper hardness will bump up to fit whatever bore size they are fired in. If you see excessive leading with cast bullets it is usually an indication the load is not hot enough for the bullet, not that it is too hot as usually thought.

Another example is .44-40. While most modern production guns have a .429 nominal groove diameter, factory ammunition is loaded with .425 (Winchester) or .427(Remington) diameter bullets.

Most shooters, reloaders not included, achieve what is to them perfectively acceptable results as regards accuracy without ever giving a thought to the actual diameter of their bore or bullets. If you prowl around many forums you will see that usually when someone asks "Why doesn't my gun shoot well", virtually no one even thinks (right or wrong) to ask about bullet/barrel relationship. What they do is go off on a tangent suggesting such things as a damaged crown, loose screws, etc.